2006
When Vermont's lone U.S. House member, Bernie Sanders decided to run for the U.S. Senate in 2006, Welch chose to run for Sanders's seat.
He defeated Republican Martha Rainville in the November 7, 2006 general election 53% to 45% in a race where both candidates pledged to be entirely positive.
 Welch was the first Democrat to represent Vermont in the House since 1961, and only the second since 1853 (though Sanders caucused with the Democrats).

2008
Welch was re-elected in 2008 with no major-party opposition, becoming the first Democrat to be reelected to the House from Vermont since 1848.
 He was in the unusual position of being both the Democratic and Republican nominee for the seat, due to Republican voters writing his name in on the blank primary ballot.

2010
Welch was re-elected with 64% of the vote against Republican nominee Paul Beaudry, Liberty Union nominee Jane Newton, Working Families nominee Sheila Coniff, and independent candidate Gus Jaccaci.

2012
Welch easily defeated Republican nominee Mark Donka, Liberty Union candidate Jane Newton, and Independent candidates James "Sam" Desrochers and Andre LaFramboise with 72% of the vote.

2014
Welch was re-elected to a fifth term with 64.4% of the vote, easily defeating Republican Mark Donka, Matthew Andrews of the Liberty Union Party and Independents Cris Ericson, Randall Meyer and Jerry Trudell.

2016
Welch ran unopposed in the Democratic primary, and also got more votes in the Republican primary than any other candidate with 4.51% of the votes via write-ins.
He defeated Liberty Union candidate Erica Clawson in the general election with 90% of the vote to Erica's 10%.
2006
When Vermont's lone U.S. House member, Bernie Sanders decided to run for the U.S. Senate in 2006, Welch chose to run for Sanders's seat. He defeated Republican Martha Rainville in the November 7, 2006 general election 53% to 45% in a race where both candidates pledged to be entirely positive.  Welch was the first Democrat to represent Vermont in the House since 1961, and only the second since 1853 (though Sanders caucused with the Democrats).
2008
Welch was re-elected in 2008 with no major-party opposition, becoming the first Democrat to be reelected to the House from Vermont since 1848.  He was in the unusual position of being both the Democratic and Republican nominee for the seat, due to Republican voters writing his name in on the blank primary ballot.
2010
Welch was re-elected with 64% of the vote against Republican nominee Paul Beaudry, Liberty Union nominee Jane Newton, Working Families nominee Sheila Coniff, and independent candidate Gus Jaccaci.
2012
Welch easily defeated Republican nominee Mark Donka, Liberty Union candidate Jane Newton, and Independent candidates James "Sam" Desrochers and Andre LaFramboise with 72% of the vote.
2014
Welch was re-elected to a fifth term with 64.4% of the vote, easily defeating Republican Mark Donka, Matthew Andrews of the Liberty Union Party and Independents Cris Ericson, Randall Meyer and Jerry Trudell.
2016
Welch ran unopposed in the Democratic primary, and also got more votes in the Republican primary than any other candidate with 4.51% of the votes via write-ins. He defeated Liberty Union candidate Erica Clawson in the general election with 90% of the vote to Erica's 10%.
Peter Welch