PROVIDENCE, R.I. (AP) — They are trying to be hopeful, but the Democratic Party’s most passionate voters are struggling to hide their frustration with President Barack Obama.

Republicans attack the president as a big-government liberal. Many liberals meeting Thursday at Netroots Nation — it describes the annual convention as “a giant family reunion for the left” — argue instead that Obama hasn’t fought hard enough for progressive priorities on taxes, health care and the economy.

Even more problematic for the president: With the election just five months away, some are threatening not to donate money or time or even vote in November for the man who overwhelmingly ignited their passions and captured their imaginations four years ago.

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