Get ready for some good Sunday night TV. Republican candidate Donald Trump and Democratic nominee Hillary Clinton are set to face off at 9 p.m. EDT for the second presidential debate at Washington University in St. Louis. 

This event will be more of a town hall than a formal debate, according to Bloomberg, with some questions coming from audience members and others from the moderators. The candidates' poll numbers will likely be discussed alongside their policies, so you might want to read up before tuning in.

As of Friday afternoon, Clinton was beating Trump by about 4.5 percentage points nationally when they were the only two candidates, according to RealClearPolitics data. When Libertarian nominee Gary Johnson and Green Party candidate Jill Stein were included, her lead narrowed to 3.7 percent. In the four-way matchup, Clinton had 44.2 percent support, Trump had 40.5 percent, Johnson had 6.9 and Stein had 2.4.

However, those were average numbers. Individual polls had varying results. For example, a Quinnipiac University survey released Friday found 45 percent for Clinton and 40 percent for Trump in a four-way race, according to a news release. Johnson had 6 percent; Stein had 3.

Clinton scored especially well among women, nonwhite voters and independents, all of  which Quinnipiac assistant director Tim Malloy said should likely signal a "wake-up call" for Trump. "Can Trump make a come-back in Sunday’s debate or will Clinton score another W?" Malloy asked.

As for the all-important swing states, Politico found that Clinton was polling higher in Colorado, Florida, Michigan, Nevada, New Hampshire, North Carolina, Pennsylvania and Virginia. Trump was winning in Ohio and Iowa.

Those numbers could make Sunday especially significant for the tycoon. "Losing critical swing states like those would significantly narrow his path to winning the White House," MarketWatch's Robert Schroeder wrote Friday. "Combined with separate polling that says Clinton did better in the first debate, the pressure’s on Trump."