Clinton has overwhelming support among Democratic Party leaders, but Sanders foresees staying competitive by drawing new and younger voters into the primary process. More than half of the delegates up for grabs in the Democratic race are on the table in March, with a heavy concentration on the first of the month — an 11 state voting bonanza known as Super Tuesday. Clinton's campaign is particularly focused on seven Super Tuesday states with large minority populations, given that preference polls show Sanders lagging far behind in support from black and Hispanic Democrats. When Clinton requested a debate be held in Flint, Michigan, which is dealing with a crisis over lead contamination in the city's water, Sanders made sure the contest was scheduled before the state's March 8 primary. Clinton already has an edge in the primaries due to her overwhelming support from superdelegates, the party leaders who can support the candidate of their choice at the Democratic National Convention. In an election where voters are frustrated with the political system, Sanders has tried to turn Clinton's backing from party leaders into a knock on her candidacy. Clinton has slightly outspent Sanders on radio and television spots aired so far, according to political advertising tracker Kantar Media's CMAG data. Beyond the delegate math and fundraising records, Democrats hope a lengthy primary battle results in a nominee strengthened by a vigorous campaign and a party energized by the process.