In addition to cementing Barack Obama's overall lead in delegates, the Potomac Primary also cut deeply into Hillary Clinton's previously established demographic strongholds - among women, Latino voters, and most interesting to us, Catholics.

In Virginia, Obama actually lead Clinton amongst Catholics - both weekly church attendees and more casual Catholics - with the more impressive margin amongst, surprisingly, weekly church attendees 55% to 41%.

In Maryland, Obama lost the Catholic vote overall, but only narrowly, 48% to 45%.

This follows Obama's strength among Catholics in Louisiana, Missouri, and many of the other states he's won and challenges the notion that Catholics as a block are a source of strength for the Clinton campaign.

More importantly, Obama's gains amongst older demographics and Latino voters in Virginia could be a sign that he will continue to gain amongst Catholics in the races to come - which could be especially important in the Clinton "firewall" states of Ohio and Texas.