The fact that the PNM was decimated in 2010 because of a perception of corruption while the UNC which has had 100 times more corrupt in the last 5 years gain votes and seats in 2015 proves my point.
Remember in 2010 the UNC won 15 seats while this time round they won 18 (an increase of 3 seats) despite all the clear corruption.
Argument done.
Not really bro. Corruption is a perception since it is difficult to quantify who is "more" corrupt. Frankly outside of the 1986-1991 government (which is likely the most corrupt we've seen since independence), all the others are comparable and debatable. You are going on the premise that UNC voters saw the PP gov't as being very corrupt. I suspect though, based on sentiments I gather, that the UNC/PP lost support moreso due to the scandals and incompetence rather than corruption perception. To say that they were more corrupt than the 2007-2010 PNM administration is subjective and an opinion over a clear fact (it could be true, or it could be false - I don't think we'll ever find out as corruption never gets properly prosecuted in this country).
The UNC did not gain seats. The UNC lost 4 seats versus 2010. The only gain was retaking the Chaguanas seat from the 2013 by-election, which they had originally won under Jack in 2010.
Look the whole who is more corrupt is definitely debatable. But the suggestion that the UNC base is more loyal/tribal than the PNM really has no foundation based on election evidence. In the last three decades, both parties have held on to a base regardless of how unpopular their government is.
There is one difference between the two parties though - if you look at voter turnout, some of the UNC core constituencies consistently get a higher voter turnout than PNM areas. Several UNC core areas (such as Couva, Fyzabad, Chaguanas, Oropuche) consistently get a higher than average vote turnout compared to the overall amount - these constituencies have seen turnouts in the 70-75% for the last several elections versus the national average being in the 60% range.
Conversely, the PNM stronghold areas like Laventille, POS, and Diego Martin have seen below national average turnouts year to year, even in the years when the PNM is very popular (like 2007). Laventille often dips below a 50% turnout when the national averages are in the mid 60%. That is a big factor why the UNC always does well in the popular vote. If you look at statistics from every election, the lowest 10 constituencies in voter turnout are almost always PNM strongholds.