 In early June , Nixon continued to be regarded as the favorite to win the nomination , but observers noted that he had not yet locked up the nomination . He still faced challenges from Nelson Rockefeller and Ronald Reagan , and was not on the ballot in California , where Reagan won a large slate of delegates . Behind the scenes , Nixon staff lobbied for delegates from " favorite son " candidates , resulting , in the backing of Senator Howard Baker of Tennessee , and his 28 pledged delegates , as well as those 58 delegates supporting Senator Charles Percy of Illinois . After the assassination of Robert Kennedy , like the other candidates , Nixon took a break from campaigning . Reports suggested that the assassination all but assured his nomination . Upon returning to the trail , Nixon found that Rockefeller had begun attacking him . Rockefeller described Nixon as a man " of the old politics " who has " great natural capacity not to do the right thing , especially under pressure . " Nixon refused to respond to the jabs , stating that he would not participate in attacks . As he edged closer to the nomination , discussions about his running mate arose . Republicans in the Midwest pushed for Mayor John Lindsay of New York City . The endorsement of Nixon by Senator Mark Hatfield of Oregon raised speculation that he might be chosen . Congressman George Bush of Texas and Senator Percy were also mentioned as possible selections . At the end of the month , Nixon had two thirds of the required 667 delegates necessary to win the nomination . 
 In early June , Nixon continued to be regarded as the favorite to win the nomination , but observers noted that he <a href='been_done' title='1'><mark>had</mark></a> not yet locked up <a href='None' title='2'><mark>the</mark></a><a href='negative_concord' title='3'><mark>nomination</mark></a> . He still faced challenges from Nelson Rockefeller and Ronald Reagan , and <a href='negative_concord' title='4'><mark>was</mark></a> <a href='negative_concord' title='5'><mark>not</mark></a>on <a href='None' title='6'><mark>the</mark></a><a href='negative_concord' title='7'><mark>ballot</mark></a> in California , where Reagan won a large slate of delegates . Behind the scenes , Nixon staff lobbied for delegates from " favorite son " candidates , resulting , in the backing of Senator Howard Baker of Tennessee , and his 28 pledged delegates , as well as those 58 delegates supporting Senator Charles Percy of Illinois . After the assassination of Robert Kennedy , like the other candidates , Nixon took a break from campaigning . Reports suggested that the assassination all but assured his nomination . Upon returning to the trail , Nixon found that Rockefeller <a href='been_done' title='8'><mark>had</mark></a> begun attacking him . Rockefeller described Nixon as a man " of the old politics " <a href='null_relcl' title='9'><mark>who</mark></a><a href='got' title='10'><mark>has</mark></a> " great natural capacity not to do the right thing , especially under <a href='negative_concord' title='11'><mark>pressure</mark></a> . " Nixon refused to respond to the jabs , stating that he would not participate in <a href='negative_concord' title='12'><mark>attacks</mark></a> . As he edged closer to the nomination , discussions about his running mate arose . Republicans in the Midwest pushed for Mayor John Lindsay of New York City . The endorsement of Nixon by Senator Mark Hatfield of Oregon raised speculation that he might be chosen . Congressman George Bush of Texas and Senator Percy <a href='uninflect' title='13'><mark>were</mark></a> also mentioned as possible selections . At the end of the month , Nixon had two thirds of the required 667 delegates necessary to win the nomination . 
In early June , Nixon continued to b regarded as the favorite to win da nomination , but observers noted that he done not yet locked up no nomination . He still faced challenges from Nelson Rockefeller and Ronald Reagan , and ain't on no ballot in California , where Reagan won a bigass slate of delegates . Behind the scenes , Nixon staff lobbied fir delegates from " fav son " candidates , resulting , in the backing of rep Howard Baker of Tennessee , and his 28 pledged delegates , as well as those 58 delegates supporting Senator Charles Percy of Illinois . After the assassination of Robert Kennedy , like the other candidates , Nixon took a break from campaigning . Reports suggested that the assassination all but assured his nomination . Upon returning to the trail , Nixon found that Rockefeller done begun attacking em . Rockefeller described Nixon as a man " of the old politics " got " great natural capacity not to do the right thing , especially under no pressure . " Nixon refused to respond to the jabs , stating that he would not participate in no attacks . As he edged closer to the nomination , discussions about his running mate arose . Republicans in the Midwest pushed for Mayor John Lindsay of New York City . The endorsement of Nixon by Senator Mark Hatfield of Oregon raised speculation dat he mite be chosen . Congressman George Bush of Texas and Senarepcy was also mentioned as possible selections . At tdaend of thdaonth , Nixon had 2 thirds of thedaquired 667 delegates necessary to win the daination .