Late last month, over sandwiches and chips at a Des Moines, Iowa, cafe, Lisa Lemon and her wife ticked off the list of potential Democratic presidential nominees. Kamala Harris. Cory Booker. Kirsten Gillibrand. And then there’s that senator from Colorado. His name escapes Lemon and Elizabeth Keest Sedrel, but they grow excited recounting his impassioned floor speech about the partial federal government shutdown. “I’d suggest he do more of that,” Lemon said. That senator is Michael Bennet, the Denver Democrat who broke out of his typical mild-mannered character Jan.