Just two days before the bitter US presidential election, national polls gave the edge to Hillary Clinton, with results too close to call in some key battleground states where the race will be won or lost.

Battleground Tracker polls showed Clinton’s lead evaporating. CBS gave Trump a one point lead in Ohio (46 to 45 percent) and showed a tied race in Florida (45 to 45 percent). Florida is the mother of all swing states, with 29 electoral votes in the electoral college, where a victor must reach 270 votes to win the presidency. The Tuesday election could hinge on roughly a dozen so-called battleground states where the contest is particularly tight.

Polling aggregates by tracker RealClearPolitics showed Clinton in the lead with 46.6 percent to Trump’s 44.8 percent.