Sarah - Yes, Obamacare passed without a single Republican vote, when the Democrats had a strong majority in the House of Representatives and a filibuster-proof majority in the Senate.  It was a major bill but it has been a huge failure with escalating costs for the American people and excessive regulations.
Regarding the Paris Accord, President Obama was either too lazy or too arrogant to sell it to the American people and did not even try to have the lousy deal ratified by the U.S. Senate.  If you know history, the U.S. Senate did not ratify the Treaty of Versailles either and it turned out to be such a bad deal it started a world war that killed 55 million people.