The July 9 fundraiser, according to an invitation obtained by The Denver Post, will also benefit the Democratic Senatorial Campaign Committee and is hosted by both Udall and DSCC Chairman Michael Bennet (D-Colo.).
Udall is in a tough reelection fight with Rep. Cory Gardner (R-Colo.), who made the swing state competitive for Republicans when he jumped in the race earlier this year.
Most polling of the race has shown Udall only slightly ahead of Gardner.
Obama’s visit to Colorado is unusual for him. He’s largely stayed away from senators due to his persistently low popularity in most of the most competitive states this election cycle.