A new Boomberg poll gives Hillary Clinton a nine point lead over Donald Trump in both a two- and four-way race in Pennsylvania. | AP Photo Poll: Clinton leads Trump by 9 in Pennsylvania

With Donald Trump’s campaign struggling to stay afloat nationally under the weight of yet another round of controversy, a new Bloomberg poll puts Hillary Clinton 9 percentage points ahead of the Manhattan billionaire in the crucial swing state of Pennsylvania.

The former secretary of state leads Trump 51 percent to 42 percent among likely Pennsylvanian voters in a head-to-head matchup between the two candidates. She fares just as well, leading 48 percent to 39 percent, in a four-way race that also includes Libertarian Gary Johnson, who polled at 6 percent, and the Green Party’s Jill Stein, who polled at 4 percent.

Pennsylvania’s 20 electoral votes are crucial for Trump’s already narrow path to victory, which would also require a near sweep of 2016 battleground states. If Trump were to win Pennsylvania, it would be the first victory there for a Republican presidential candidate since 1988.

One major key for both candidates to victory in the state will be winning the support of voters in Philadelphia’s suburban counties, once reliably Republican areas. But voters polled by Bloomberg from that area favor Clinton by a wide 28-point margin in the two-way race, 59 percent to 31 percent.

As Trump’s campaign has bled support among prominent Republicans, worry that his candidacy could damage down ballot races has grown as well. One such contest is in Pennsylvania, where Democratic challenger Katie McGinty leads incumbent GOP Sen. Pat Toomey, 47 percent to 45 percent.

The Bloomberg poll was conducted from Oct. 7-11, reaching 806 likely Pennsylvania voters, 373 of which live in suburban Bucks, Montgomery, Chester and Delaware counties outside of Philadelphia. The margin of error for likely voters is plus-or-minus 3.5 points, while the margin of error for suburban voters polled was plus-or-minus 5.1 points.