The birth charts of the modern versions of the Democrats and Republicans, from astroworld.us
http://www.astroworld.us/archives/democraticparty.html">Democratic Party
http://www.astroworld.us/archives/gopjul6.html">Republican Party
I've never been all that certain about the Dems' chart, but the Republican chart seems to be about right. Republicans have always played up the whole "Mom and Apple Pie" theme/meme, and that's evident in the party's Cancer Sun, closely conjunct the US' July 4 Cancer Sun--so there is some definite resonance there between the ego/identities of the two. It might also go along way to explain the certain level of appeal of another July 6 born Cancerian individual--George W. Bush.
Interesting that the GOP's power and secrecy-oriented Scorpio Moon is tightly square the US' freedom-seeking, humanistic and rebellious Aquarius Moon (July 4 sibley chart). Despite appearances to the untrained, the party's motives are deeply and irreconcilably at odds with those of the American people. Emotional manipulation, appeals and deceit are par for the course where the GOP is concerned.
On the other hand, concerning the Democratic Party's chart, the Aquarius Moon in the Dems chart is tightly conjunct the US Moon. Their ideals and motives DO resonate with those of the American people. The problem may be the close square with the party's Sun and Mercury in Taurus, plus the presence of Venus very early in Taurus. Taurus can be all about money--the lure of corporate support via financial contributions in the DLC era has been too great for party leadership to simply brush off.