IRS steps up scrutiny of tax-exempt political groups  WASHINGTON
Fri Jun 29, 2012 11:05am EDT    Credit: Reuters/Chip East
WASHINGTON (Reuters) - The Internal Revenue Service is signaling
that it will increase its scrutiny of tax-exempt political
organizations, which are becoming a force in elections by
raising tens of millions of dollars from undisclosed donors.
The move comes as such tax-exempt groups - many of which have
better-known sister organizations known as "Super PACs," or
political action committees - are under criticism from Democrats
and some Republicans for using money from anonymous sources to
try to influence elections.  Like Super PACs, tax-exempt
political groups can raise and spend unlimited funds - in
contrast to political campaigns, which may receive only $2,500
per donor each election cycle.  Super PACs, which must disclose
their donors, operate independently from campaigns but may
release ads that boost or attack specific candidates.  Tax-
exempt groups, meanwhile, can qualify under t