How Ohio primary results get calculated

All eyes are on the Texas and Ohio primary elections today.  The GOP ticket is fairly certain by now, with John McCain well in front of Mike Huckabee.  But the Democrats are still VERY close.  Barack Obama leads Hillary Clinton in pledged delegates.  A win in Texas or Ohio could put him out of Clinton's reach and secure him the nomination.  On the other hand, if Hillary comes up with big wins in both states, she could regain her lost momentum.

Given the importance of today's primaries, I wanted to better understand how results get calculated in Texas and Ohio.  I posted info on the Texas Primary here.



The Washington Post has a great description of how the Ohio Primary is run:

Ohio

Of Ohio Democrats' total of 162 delegates, 92 will be district delegates, with each of the state's 18 congressional districts getting between four and seven. Even within each district, the delegates will be handed out proportionally based on the popular vote there.

There are also 31 at-large delegates and 18 "Public Leaders and Elected Officials," or PLEO's. Those 49 delegates will also be handed out proportionally, based on the statewide primary results. The state also has 21 unpledged superdelegates.

Ohio Republicans hand out a total of 88 delegates -- 54 district delegates, 31 at-large delegates and three "unpledged" Republican National Committee members.

The statewide winner of Tuesday's GOP primary automatically gets the 31 at-large delegates. The 54 district delegates are split up among the state's 18 congressional seats, so the winner of each district gets three delegates.

But there is one quirk -- Ohio voters will actually pick those two types of delegates separately. So Republicans will vote twice Tuesday -- once for which presidential candidate should get their congressional districts' delegates, and then again for which candidate should get the at-large delegates.