WASHINGTON (AP) — Vice President Joe Biden is ramping up his role for the Democratic Party, putting his political weight behind a voter-expansion effort and rebooting his dormant Twitter handle just in time for the midterm elections.

A video released Monday by the Democratic National Committee puts Biden front and center in the Democratic pushback against voting restrictions advocated by Republicans and their allies in states across the country. The long-running debate between Democrats and Republicans on such laws takes on outsize importance in an election year in which turnout among Democrats could be decisive in determining whether Republicans can seize the Senate and strengthen their House majority.