On the eve of a five-state showdown Tuesday, Bernie Sanders’ campaign has dropped its focus on winning marquee states in favor of scooping up delegates anywhere it can find them, hoping to show he still has a chance of overcoming Hillary Clinton’s large lead and capturing the Democratic presidential nomination.

Sanders’ shift in strategy is a response to the hard realities of delegate math: Despite an upset victory in Michigan last week that cheered his supporters he is losing ground to Clinton and in danger of reaching the point where it is impossible to catch up.