Oligarch support

How many times can I upset the oligarchs while maintaining their support? If I take a bribe from tusk then don't do what he wants does it upset him only or all the oligarchs? Can I build the l-1 railway and veto the workers bill then raise taxes on them? When oligarch support is being checked (the assembly vote) is their a "floor" and "ceiling" for how much they affect it? For example, if I have the pair minimum of oligarch support does that count as a few votes while having the maximum counts as a few dozen?