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WASHINGTON – Democratic incumbent Mark Udall holds the fundraising edge over his Republican rival, Rep. Cory Gardner, in the hotly contested Colorado U.S. Senate race.

Udall, one of the most vulnerable Democrats seeking re-election this fall, raised $3.1 million in the April-June period and had $5.7 million in cash as of June 30, according to data provided by his campaign Monday ahead of the Federal Election Commission's Tuesday filing deadline.

Rep. Cory Gardner, a Yuma Republican who's giving up his 4th Congressional District seat to challenge Udall, raised $2.7 million and had $3.4 million remaining as of June 30, his campaign said last week.

Independent groups are also spending millions on the closely watched race, mostly on broadcast ads.

Republicans need a net gain of six seats to regain control of the Senate. Democratic incumbents in North Carolina, Louisiana, Arkansas and Alaska are also considered especially vulnerable.

Republicans are expected to retain control of the House, where they hold a 234-199 advantage over Democrats.

(Copyright © 2014 USA TODAY)

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