Illinois Primary: Mitt Romney Projected Winner

GOP frontrunner needs to double delegate count in order to secure nomination.
3:00 | 03/20/12

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Transcript for Illinois Primary: Mitt Romney Projected Winner
To another big night in politics your voice your vote of the president's home turf Illinois. A -- -- tonight we'll put Mitt Romney one step closer to wrapping up the nomination and today ABC's Jake Tapper did the math on what that victory would cost Jake. Good evening Diane what we're waiting for official results here in Illinois we thought we take a look at Mitt Romney's long hard slog to the Republican nomination. By the numbers. Killing time before the Illinois Republican primary returns come in front runner Mitt Romney participated in a Google+ -- this afternoon. Do everything I cab. To bring people together. To accomplish. What has to -- so how close is Romney to winning the nomination. Let's do a search -- -- Not even halfway there. Romney has won 521. Delegates out of a total 1144. Needed to win. So we still need 623 more delegates. -- Romney has amassed more than double the number Rick Santorum has won so he's far in the lead. There are still 24 states and more than 12100 delegates left outstanding. Romney has to win at least 47%. Of them Santorum has to win. 67%. Quite unlikely so what has this -- rightly so far. Financially just looking at the cost of TV ads Romney and his allies have spent 45 million dollars. That totals twelve dollars forty cents her vote. By contrast Santorum and his allies have spent three dollars per vote a relative bargain. Well at stake a look at the political cost for instance how negative had a -- TV ads business. Santorum voted to raise the debt limit five times 86% of the ads from Romney as allies have been negative. And that too has exacted a price. So how popular it's -- now last September more Americans had a favorable view of Romney -- an unfavorable one it's now the opposite. More Americans see him unfavorably. And -- preliminary exit poll result seemed to indicate that this is a much more hospitable state. For Mitt Romney then -- Mississippi or Alabama. With Romney may be even having won in that -- category best understands the problems of average. Voters that's been an area that he's had some difficulty in past primaries and caucuses I am. Big results coming in tonight thank you chain.

This transcript has been automatically generated and may not be 100% accurate.

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