Here in the United States, Super Tuesday has arrived. Twenty-four states are up for grabs in what could be the decisive day in the race for the Republican and Democratic presidential nomination. Polls show Senators Hillary Clinton and Barack Obama in a dead heat in several states. Both Democratic candidates spent the day campaigning in the Northeast. Clinton addressed supporters in Massachusetts.

Sen. Hillary Clinton: “We’re supposed to plant the trees that all of you will seek shade under. We’re supposed to make sure that this country remains great and good. And there is no guarantee. There is no guarantee written in some book somewhere that America will remain the greatest nation in the world. It is up to us, each and every one of us, to make the decisions that will guarantee that comes true.”

Obama, meanwhile, spoke in New Jersey, where he’s narrowed Clinton’s lead to a dead heat.

Sen. Barack Obama: “If you want to keep the dream alive for those who still hunger for justice and still thirst for opportunity, then I promise you this: we will not just win here in New Jersey, we will win all across this nation on Tuesday, we will win the nomination, we will win the general election, and you and I together, we will change this country, and we will change the world.”

Both the Clinton and Obama campaigns say they expect the race to extend into the primary contests in March and April. On the Republican side, Senator John McCain is leading national polls, but Massachusetts Governor Mitt Romney is ahead in delegate-rich California.