Thursday morning's event was held outdoors at Sloan's Lake Park, which provides a sweeping view of the mountains. Will.i.am deejay'd before the president's arrival on the chilliest morning of the fall so far in the city.
The Obama campaign encouraged people to meet Tuesday's voter registration deadline.
Will.i.am will head to Boulder and Fort Collins later on Thursday to encourage college students to register. The campaign is also launching an RV tour that will continue through Tuesday.
Interior Secretary Ken Salazar and Sens. Mark Udall and Michael Bennet will be on board Thursday, making stops in Frisco, Avon, Glenwood Springs and Grand Junction.
(Copyright 2012 The Associated Press. All rights reserved.)