mattoperry

A great way to promote a MoveOn petition campaign is to feature it on your blog or site. This plugin embeds petitions into your content and theme. Your readers will be able to view and sign these petitions in place. For more on MoveOn’s campaign tools and petitions, please visit http://moveon.org.
This plugin provides three ways to integrate a campaign into your site:
<ul>
<li>A sidebar widget: a new MoveOn Campaign widget type will appear, and be eligible for placement in your widget areas.</li>
<li>A shortcode: use the <code>[moveon-campaigns-petition]</code> shortcode in your content to embed a petition directly in a post.</li>
<li>A template function: you can call the function <code>moveon_campaigns_petition</code> from anywhere in your theme.</li>
</ul>

MoveOn Campaigns

Display and sign MoveOn.org campaign petitions on your site.  Integrate directly into you theme or content, or use as a sidebar widget.

Philip John

Now completely written for WordPress v3.4.2 this plugin provides a great little widget for giving your visitors the opportunity to write to their political representatives using just their postcode.
Just install, go to Appearance > Widgets and drag the new widget to your sidebar – voila!

WriteToThem Widget

A widget which provides an entry point for mySociety's WriteToThem.com, now completely re-written.

MoveOn Campaigns vs WriteToThem Widget