Former President Bill Clinton will attend a major fundraiser for Rep. Shelley Berkley (D-Nev.), who is running for the Senate against Sen. Dean Heller (R-Nev.).

The race is one of Democrats' best chances for picking up a Senate seat next year.

Clinton will lend a hand to Berkley on Jan. 7 in Las Vegas. The former president remains one of the most popular Democrats in the country; he won Nevada in both his presidential campaigns.

Berkley has proven herself a strong fundraiser, outpacing Heller's $2.7 million with $3.2 million in the bank already.

The race has been tied in most polls and is expected to be one of the most closely contested of the year. Republicans need to net four seats to take control of the Senate (if President Obama wins reelection). If Democrats can win this race, they will be in a much better position to retain control of the chamber.