Could the PTB and PSD have given separate rival candidates for future elections if Brazilian military coup had not happened?

Could the PTB and PSD have given separate candidates for future elections if Brazilian military coup had not happened?

Basically the PTB-PSD were always in a coalition in otl and never faced off against each other. So for a tl I have this question of whether they could have given rival candidates for presidential elections in the future(late 60s to late 70s) if military coup hadn't destroyed Brazilian democracy.

or were they forever destined to only be in a locked coalition with each other.

Note: PTB was growing as a powerful party and could have become 2nd largest party by the late 60s.

@Vinization @Gukpard
 
In a word, yes.

More detailed answer: PTB was quickly overtaking the PSD as the biggest party in Brazil in the early 1960s. As said by the OP, by the next congressional elections, they would have become the second biggest party, and they would have a shot at becoming the largest one by the one after that. Furthermore, PTB was sympathetic to causes the PSD bosses weren't keen on, to say the least(land reform being the main one).

I am convinced that by the early 1970s, we would have a major political realignment - a PSD/UDN alliance against PTB. It would be the last chance for PSD to stay relevant(their support base was rural and small towns, and by 1965, Brazil became majority urban - that's why PTB was growing so much). Barring an event that changes everything(like 1964 did), UDN is poised to absorb PSD by the mid-1980s.
 
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