column width of membership status on contribution pages with member sign-up is too small

The table column with membership sign-up options on contribution pages has a width of 95% that does not change event, and when there is a status message about a current membership (e.g. "Your Individual Member membership expires on March 22nd, 2013.") the status message is squished to the right edge.

To recreate:
1. Create a contribution page with a membership sign-up enabled
2. Become a current member
3. Visit the contribution page, and see the squished status of your membership status (e.g. attached "Picture 7.png")

Desired behaviour is to give the status message a wider column width. (e.g. attached Picture 8.png)

The attached patch for "/templates/CRM/Contribute/Form/Contribution/MembershipBlock.tpl" demonstrates one possible approach.