"Though both are still long shots, they could force her to compete for support from the liberal base, potentially hurting her chances in the general election," it said.

Among the Republicans, she leads former Florida governor Jeb Bush 54 percent to 40 percent in a matchup and with even larger margins over Texas Senator Ted Cruz, Wisconsin Governor Scott Walker and Florida Senator Marco Rubio, Time said.

Louisiana's Indian-American governor Bobby Jindal is still toying with the idea of a presidential run.

But potential Republican candidates lost no time attacking Clinton leaving criticism of likely primary rivals within the party for another day.

Rubio, 43, the youngest contender in the race so far, took a swipe at Clinton Monday.

"Just yesterday, a leader from yesterday," he said as cited by CNN, as the crowd erupted in boos, "began a campaign for President by promising to take us back to yesterday. But yesterday is over, and we are never going back."

Kentucky Senator Rand Paul released a video ad critical of Clinton hours before she officially declared her candidacy Sunday saying she "represents the worst of the Washington machine, the arrogance of power, corruption and cover-up".

Cruz, another official 2016 GOP candidate, questioned her success as secretary of state saying "Hillary Clinton represents the failed policies of the past".

Bush turned the Clinton debut into a fundraising opportunity telling his supporters in an email that "Hillary plans to raise $1.7 billion to win the White House ... which is why I'm asking you to give $5 right now" to "stop her."

With hardly any opposition worth the name, Clinton may easily win the Democratic primary, but "she'll face a battle-tested Republican opponent who will be in tip-top shape to take on the Democrats," Time suggested.

However, her "supporters argue that even without a major primary fight, she'll be ready too," it said.
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