No. 11074, Friday 02 May 14, Scintillator

In Chennai, they might call Scintillator as poll-a-Dhavan (பொல்லாதவன்). 
And I am not sure if any other Dhowan/Dhawan/Dhavan (not Bhavan!) are connected.  Overall, I have several doubts ... (maybe I have missed to highlight some)

                                                                                               Cartoon by Rishi

ACROSS
1 Past income tax register is what a psephologist needs (4,4) EXIT POLL (EX IT POLL)
5 Orders online books to learn meanings in short (6) EDICTS (E DICTS.= dictionaries)
9 Everybody in church comprising a union (8) ALLIANCE (ALL IN CE around A)
10 Chemical compounds sourced from high-quality quarries (6) AMINES (A MINES)
12 Recluse with no set private space (9) ENCLOSURE (RECLUSE NO)*
13 Velocity possessed by dry wind (5) CURVE (V possessed by CURE)
14 Collective opinion suggests possible veto (4) VOTE (VETO*)
16 Send communication signal without medium to pass across (7) TRANSIT (TRANSmIT)
19 Bearing mark of social acceptance, work fast to get rich (7) OPULENT (OP LENT to get U)
21 Indian tennis player said to get benefits (4) PAYS (~PAES, Leander) Benefits are usually called perks, pays is what one directly gets and works for=benefits ?
          It certainly pays to play tennis!  And, I understand, in some parts of the country to vote!
24 I’ve New Delhi ideally administering as capital (5) INDIA (I N D I A) &LIT, but I think the initial letter indication is not clear, correct in number, and on double duty) But then capitals would be wrong def
25 Determine what’s spoken about polls (9) ELECTORAL (ELECT ORAL)
27 Holy man employed in Israel to teach (6) INSTIL (IN ST. IL) in on double duty
28 Voting right without trace of equality-be afflicted over a generation (8) SUFFRAGE (SUFFeR AGE)
29 Son not part of lineage that’s dignified (6) DECENT (DEsCENT)
         What this election campaign is certainly not!
30 In my opinion, it’s easiest to travel around Italy (2,1,3,2) AS I SEE IT (EASIEST* around I)

DOWN
1 Stationers are expected to stock up one (6) ERASER (T<) &lit?, but there seems to be an error ... Stock up on only one eraser?
          Some of you may wonder why this is highlighted as a themed entry.  Remember a leader who asked people to erase the mark and vote again?
2 Fortunate to be not present at UP’s capital (2,4) IN LUCK (IN LUCKnow)
3 Soft panties set out to be worn over (5) PIANO (PANtIes O)
          Interestingly, when I started learning to play the piano, I found that it was called Pianoforte, or rather soft-hard, as it embraces many octaves
4 Masterly speech? (7) LECTURE CD
6 See spirited protest fronting people’s rule (9) DEMOCRACY (DEMO is at the front of C=see RACY)
7 Assembly processing contents without support of private detective (8) CONGRESS (pROCESSiNG)* Processing on double duty as anagram indicator and fodder ...
          The various meanings this word has !
8 Upset about riots, army arrests possible criminals (8) SUSPECTS ((UPSET C)* in SS) SS was a police force, not an army, IMO
11 Raise a toast, having won constituency (4) SEAT (T)
15 Campaign to limit open quota (9) OPERATION (OPEn RATION)
17 Teenager, when God showed up, turned over a new leaf (8) MODIFIED (MOD(modern chap) IF DEI<) God=Deus, Dei is Gods ...
18 Having collected an order of dismissal, said to face dead end (3,2,3) CUL DE SAC (~CULLED SACK)
20 Bystander on roads targeted frequently (4) TREE (TaRgEtEd)
21 Supplement distributed without favourite columns filled (7) PLENUMS (SUPPLEMENT-PET)* Not very comfy with the defn.
22 Knight displaces diamonds from secret gallery (6) ARCADE (ARCA(nD)E) Either the substitution seems incorrectly indicated or the definition is wrong
23 Lawyer’s customer is right to be present in court (6) CLIENT (LIEN in CT)
26 Clusters of workers with newspapers (5) TUFTS (TU FT.S) The plural of Financial Times is FTS?
          Can you give me a few Financial Timess, pleez?

Maybe some more words like Opulent can be added (as they may try to buy votes), Tree (since EVMs reduce use of paper)  ...
As CV's cartoon puts it, my cartoon department is closed for elections today!