Personhood for fertilized eggs with not be on the Montana ballot this year due to a lack of signatures supporting an amendment.  Supporters of the amendment were 12,000 signatures under the necessary number of valid, registered voter signatures needed to add an amendment vote to the 2010 ballot.
KFBB News reports:

CI-102 will again fell short of the required 48,764 signatures needed to appear on the November ballot with only 36, 376 signatures gathered.

The pro-life ballot issue would have made it legal for a woman to be criminally investigated for miscarriage and would have banned certain methods of birth control. CI-102 would have led to a complete ban on abortion with no exceptions.

Planned Parenthood of Montana says that CI-102 would have undermined the state’s 40-year-old constitutional right to privacy.

Colorado, who was able to get a Personhood amendment on the ballot this year, began launching their campaign to amend the state constitution yesterday.