A Nevada congresswoman just endorsed Joe Biden. Here's why that's important.

Rep. Dina Titus (D-Nev.) endorsed former Vice President Joe Biden's Democratic presidential bid Monday during a CNN interview.

Titus, who has worked with Biden in the past, called the former vice president the "best qualified" candidate among a field of "good Democratic" contenders who's built a "broad coalition" in her Nevada district, which includes most of Las Vegas.

Titus' endorsement is notable because she's the first sitting member of Congress from an early voting state (Nevada on Feb. 20 will become the third state to select a nominee, after Iowa and New Hampshire) to back a candidate in the Democratic primaries.

President Trump lost Nevada to Hillary Clinton in 2016, but it was a fairly close race that ended with the candidates just 2 percentage points apart.

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