Many believe that Hillary Clinton has the 2016 Democratic nomination sewn up—if she decides to run. That may be premature. Joe Biden also may want to join the contenders. The vice president visited Iowa on Wednesday for a kickoff event in Des Moines for a tour by Nuns on the Bus, a group that draws attention to the effect corporate money has on political campaigns. But some pundits are saying his visit has political implications, especially as it comes days after Clinton also hit the state. Biden is known to have presidential ambitions, but his path is made difficult by Hillary’s presence in the equation. Trips such as the Iowa visit at least keep his name out there.