Voters both Democratic and Republican will be heading to the polls Tuesday, taking part in presidential primaries in five states that will yield 384 Democratic convention delegates and 172 Republican ones.

Both Hillary Clinton and Donald Trump hold leads in Pennsylvania, the state with the largest delegate count up for grabs Tuesday.

According to an NBC/Wall Street Journal/Marist poll, Trump enjoys a 18-point lead in Pennsylvania with 45 percent of  likely Republican voters saying they support him. Texas Sen. Ted Cruz has 27 percent and John Kasich has 4 percent.

<<Click  here to see real-time results  from Tuesday's primaries

That poll was taken prior to Cruz and Kasich’s announcement Sunday that they will join together in the primaries following Tuesday’s contests to try to keep Trump from getting a majority of the delegates needed to win the Republican nomination for president outright.

For the Democrats, Clinton is ahead of  Vermont Sen. Bernie Sanders in Pennsylvania by 15 points, 55 percent to 40 percent,  among likely Democratic voters.

Here’s a look at what’s coming on Tuesday and what’s at stake.

Which states are holding primaries Tuesday?

Both Democrats and Republicans are holding primaries in Connecticut, Delaware, Maryland, Pennsylvania and Rhode Island.

What’s at stake?

Delegates to the national nominating conventions. Here’s the breakdown of the delegates up for grabs Tuesday.

>> How many delegates does Donald Trump have?

For the Republicans:

Connecticut – 28

Delaware – 16

Maryland – 38

Pennsylvania – 71

Rhode  Island – 19

For the Democrats:

Connecticut   – 55 – with 15 being superdelegates

Delaware – 21 – with 10 being superdelegates

Maryland – 95 – with 23 being superdelegates

Pennsylvania – 189 – with 21 being superdelegates

Rhode  Island – 24 – with 9 being superdelegates

What is a superdelegate, and what do they do?

How many delegates are needed to win the nomination?

For Democrats, 2,383; for Republicans, 1,237.

Polls opening/closing

Connecticut – 6 a.m.-8 p.m.

Delaware – 7 a.m.-8 p.m.

Maryland – 7 a.m.-8 p.m.

Pennsylvania – 7 a.m.-8 p.m.

Rhode  Island  – 7 a.m.-8 p.m.