Biden trails recent Democratic incumbent presidents on the issue: Barack Obama announced he would run for a second term in 2012 on April 4, 2011, and Bill Clinton's 1996 re-election announcement was April 14, 1995.
Jimmy Carter, however, waited until Dec. 4, 1979, to announce his 1980 re-election run.
He would be 86 at the end of a prospective second term.
But the trip here just reinforced my sense of optimism about what can be done," Biden told reporters at the tail-end of an emotional trip to Ireland last week.
This week, Biden plans remarks on childcare and environmental justice, along with a visit to a labor union training facility in Maryland to talk about the economy.