A former U.S. Senate candidate whose 2010 election contest brought a deluge of almost $16 million in independent expenditures into the state has announced he will try again in 2014.

Republican Kenneth Buck, who lost to Sen. Michael Bennet, D-Colo., in 2010, has announced he will run in 2014 for the other U.S. Senate seat now held by Sen. Mark Udall, D-Colo.

Buck had almost $12 million spent against him in the 2010 race. Spending against him were groups such as the Democratic Senatorial Campaign Committee ($7.9 million), the NEA Advocacy Fund ($1.9 million), and the American Federation of State County & Municipal Employees PEOPLE ($1.2 million); among others.

Buck’s campaign raised and spent about $5 million, including $4.2 million from individuals and $498,547 from PACS and other committees. Of his itemized individual contributors, $1.8 million came from inside Colorado and $1.3 million from outside the state.

View Buck’s 2009-2010 financial profile.