PHILADELPHIA (AP) — Donald Trump is aiming for a sweep of all five Northeastern states holding primaries Tuesday, including Pennsylvania, leaving his rivals pinning their hopes of stopping the Republican front-runner on a fragile coordination strategy in the next rounds of voting. For Democratic leader Hillary Clinton, wins in most of Tuesday's contests would leave little doubt that she'll be her party's nominee. Rival Bernie Sanders' team has sent mixed signals about his standing in the race, with one top adviser suggesting a tough night would push the Vermont senator to reassess his bid and another vowing to fight "all the way to the convention." The Democratic race is far more settled than the chaotic GOP contest, despite Trump having a lead in the delegate count. Kasich has won just a single primary — his home state — but hopes to sway convention delegates that he's the only Republican capable of defeating Clinton in the general election. Cruz and Kasich's public admission of direct coordination was highly unusual and underscored the limited options they now have for stopping the real estate mogul. Clinton is on solid footing in the Democratic race and enters Tuesday's contests having accumulated 82 percent of the delegates needed to win her party's nomination.