In Kentucky, where Democrat Alison Lundergan Grimes is challenging Senate Minority Leader Mitch McConnell (R), Clinton recorded a video endorsing Grimes in which he says the nation needs more political leaders “willing to work together across the lines of party, geography and philosophy.”

“We have simply got to have more people who are willing to reach across the aisle and say, ‘I’m ready to work with you to build a better future,’ ” Clinton said.

In his Virginia speeches, Clinton said that he learned through eight years as president and 12 years as Arkansas governor that it’s important to advocate for your own philosophy but a mistake to not consider your opponent’s.

“When you’ve got a complicated set of problems with a lot of moving parts — and even Albert Einstein couldn’t give you the right answer to every question — the only thing that works is cooperation,” Clinton said Sunday in Dale City.