He joined fellow Democrat Brad Ellsworth (D-8th District) in Indianapolis and three other Indiana cities Friday.
This is their first campaign trip together but Bayh said he'll do whatever Ellsworth needs him to do in the weeks leading up to the November elections. Bayh is retiring after 12 years in the Senate.
He said Rep. Ellsworth is the right man to replace him.
"Now is the time to step up and explain why Brad is the right person to get the job done," said Bayh.
"When he decided to retire I knew it would be big shoes to fill, but shoes that I am willing to fill because Evan Bayh is what's right in Washington. We hear so much about what's wrong in Washington. This gentleman is what's right," said Ellsworth.
Ellsworth said if elected to the Senate, his focus will be on job growth in the Hoosier state.
Ellsworth's competitor was campaigning in Southern Indiana Friday. Republican Dan Coats stopped at a small family-owned business in Jeffersonville. He said the big issues that matter to Americans are tax cuts, immigration and repealing President Obama's health care reform law.
Coats is a political veteran having served Indiana as Senator in the past.