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Arizona Sen. John McCain noted that Monday's court ruling left standing the meat of the campaign finance bill.

WASHINGTON (CNN) - The Supreme Court's reversal of federal limits on independent political advertising has the potential to add "another X factor" to an already-unpredictable 2008 presidential race, one campaign finance analyst said Monday.

"It adds more money. It adds the potential for more upheaval from ad campaigns that the campaigns may want to stay away from," said Evan Tracey, a campaign finance analyst at TNS Media Intelligence.

Monday's 5-4 ruling struck down a key provision of the 2002 McCain-Feingold campaign finance law that barred third-party issue advertising 30 days before a primary and 60 days before a general election and restricted the use of candidates' names.

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