Donald Trump. Joe Raedle/Getty Images Donald Trump is gaining ground in a state that many considered to be left for dead: Pennsylvania.

Four Keystone State polls published Wednesday — from Susquehanna, Monmouth University, CNN/ORC, and Quinnipiac — showed Trump trailing Democratic nominee Hillary Clinton by between 2 and 5 points. They followed another recent poll from the GOP firm Remington Research that showed Trump trailing by just 2 points.

As a result, Clinton's lead in the RealClearPolitics four-way polling average — which includes Libertarian nominee Gary Johnson and Green Party nominee Jill Stein — has dipped to 4.9 points. In early October, she held a nearly 9-point average lead in the state.

While Clinton is near her high-water mark of support in the average — currently 47.3% — Trump his his general election high of 42.4% support in the aggregate.

This is in line with recent polling results that have shown Trump making a bit of a comeback nationally, highlighted by Clinton's 1.7-point lead in the national RCP average in a race between the candidates. A slew of swing-state polls released by CNN and Quinnipiac University on Wednesday showed Trump closing in other battleground states, as well.

In the CNN polls, Clinton held a 2-point lead in Florida and faced a 6-point deficit in Nevada. In the Quinnipiac polls, she led by a point in Florida and 3 points in North Carolina, while trailing by 5 in Ohio.

Pennsylvania — which awards a treasure trove of 20 electoral votes — has not voted for a Republican since George H.W. Bush in 1988. Based on current trends, Trump needs to win three of these four states to have a shot at securing the presidency: Pennsylvania, Florida, Ohio, and North Carolina.

Trump has recently targeted Pennsylvania, holding a rally in Valley Forge on Tuesday and having top surrogates roll through the state this week.