Prior to becoming a candidate for vice-president Palin had successfully challenged the good-old boy network in Alaska GOP. She had the backing of Democrats in the legislature. However, after the elections were over, she lost support from Democrats and experienced numerous ethics complaints. Basically she has no tools to effectively govern Alaska - yet she was forced to defend herself and spending money on lawyers.
By resigning she can focus on making money and building network for possible future run for a national office.
By resigning she can focus on making money and building network for possible future run for a national office.