McCain has a rating of 81.8, so Cassidy isn't too far ahead. Both Mike Lee and Ted Cruz have a rating of 100.
Maness isn't a politician, and hasn't held office, so he's not rated. But for myself have compared him to a Rand Paul / Ted Cruz, as well as a few radio personalities that have interviewed him. Did I mention that Ted Cruz rating was 100?
Heritage bad votes he took:
Cassidy-Grimm-Palazzo Amendment to Delay Phaseout of Flood Insurance Premium Subsidies
Food Stamp and Farm Bill
Reform the Federal Sugar Program
Limit Crop Insurance Premium Subsidies
Cut $1.5 billion from the Department of Energy
Permanent Farm Bill
The Ryan-Murray Spending Increase Budget
$1.1 Trillion Omnibus Spending Bill
On the Commission to Study Feminist History Museum
On OPIC Reauthorization
WRDA Conference Report
Energy Freedom and Economic Prosperity Act
Protecting American Taxpayers and Homeowners Act of 2013
House Transportation Empowerment Act
Higher Education Reform and Opportunity (HERO) Act
http://www.heritageactionscorecard.com/members/member/C001075
GOP-E and the "money" will be behind Cassidy, but hopefully Maness will prevail.