Bennet hasn't won a majority of the vote in his Senate elections
Margin of victory for Colorado's Senate race in 2010 and 2016
Two bar charts show the margin of victor for Michael Bennet in 2010 and 2016. In 2010, he won 48.08 percent of the vote; in 2016, 49.97 precent.
"All others" includes candidates that ran under the Green Party, Independent Reform Party, Libertarian Party and Unity Party, as well as those that were unaffiliated and/or write-ins.
Source: Dave Leip's Atlas of U.S. Presidential Elections