Vote on Post and Display Who Voted via gravatar thumbnail.

Realwebcare

WP PostVoting

"WP PostVoting" plugin allows visitors to vote on your blog's content with a widget of the most voted posts.

PluginsPoint

Kento Vote Plugin is count your vote and display voter thumbnail under vote button who voted on your post.
Plugin Features
<ul>
<li>Up/Down Vote.</li>
<li>Up/Down vote Count.</li>
<li>Display Thumbnail who voted on post.</li>
<li>Popup Login Box if user not logged. </li>
<li>Current Vote Marker for logged in user Up/Down vote.</li>
<li>Unique Vote Count, if user voted will not able to vote again on same post.</li>
</ul>
Live Preview: http://kentothemes.com/demos/kento-vote/kento-vote-plugin/

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