Please see:
http://www.realclearpolitics.com/epolls/2008/president/pa/pennsylvania_democratic_primary-240.htmlPuerto Rico will go to Clinton. She'll win it. Historically, ever since PR has been allowed to take part in the US noms, they have gone 100% for one candidate. There are 63 delegates there for Clinton.
Every political analyst looking at this says that HRC and BO are going to split the remaining pledged delegates right down the middle. So why should she drop out? Right now, neither HRC or BO can win the nomination with pledged delegates. The super delegates are going to make the decision and polls in swing states (imp. ones like PA, FL, OH) show OB losing to HRC.
For John McCain versus BO, the last three polls have JJ McC winning:
http://www.realclearpolitics.com/epolls/2008/president/us/general_election_mccain_vs_obama-225.htmlThen, J McC vs. BO in PA:
http://www.realclearpolitics.com/epolls/2008/president/pa/pennsylvania_mccain_vs_obama-244.htmlDems have not lost PA for the last five election cycles. Bottom line is, when the superdelegates review how badly BO is tracking against J McC in states Dems have never lost, they are going to go for the one who can win, HRC, because she has the better chance of winning.
Real Clear Politics is a great site updated frequently.
Cheers!