It's Super Tuesday in the US, and that means Americans are gearing up to vote coast-to-coast in the latest round of the US presidential primaries. The Republican and Democrat candidates will be battling it out across the country to win the most delegates ahead of national conventions in August. +++Grafik rein +++ 24 states, shown here in yellow, hold primaries and caucuses today. At stake are more than half the pledged delegates for the Democratic Party. +++Grafik raus +++𐑪 On the Republican side, the latest polls indicate that John McCain has a lead over his rival Mitt Romney. And for the Democrats, the race between Barack Obama and Hillary Clinton still seems too close to call.